Yak 18T Flight Operations Manual
Page 39 of 82
Disclaimer: This manual is to be used as a reference only, it is based on translated Yak 18T Flight Operations
Manuals and has not been approved by the Yakovlev Design Bureau or any other authority.
•
Training flights into cloud are
NOT
allowed. In the cases of inadvertent IMC, the pilot
must level out by a smooth pulling of the yoke and continue to pilot the aircraft relying
on the gyro-horizon and electrical turn indicator. The pilot must compare the readings of
the –
•
gyro-horizon and electrical turn indicator and make sure that there is
NO
banking or
turn
•
gyro-horizon and the VSI indicator and make sure that the aircraft is flying
HORIZONTALLY
The pilot should
CONTINUE
instrument flying and perform a
180°
turn using a
maximum
15°
angle of bank and
SET
a descent of
2-3m/s
to break out of the clouds
•
Flying
OVER 4000m
can be performed only if
OXYGEN
equipment is available on board
7.6. Horizontal Flight
When performing circuit flights (undercarriage up or down) it is advisable to maintain an IAS
of
170-180km/h. CHECK
for normal engine running conditions during horizontal flight,
these are the same for flight planning.
•
After climbing to a specified level,
SET
the speed and engine boost pressure according to
the engine regime selected. At normal conditions during horizontal flight, the engine
instruments should read as follows –
Fuel pressure
0.2-0.5 kgf/cm²
Engine inlet oil temperature
50°C-65°C
Oil pressure
4-6 kgf/cm² 1.0kgf/cm² at minimum
rpm
Cylinder head temperature
140°C-190°C
Carburettor inlet air temperature
≥
+10°C
•
During warm weather, carburettor heat must be
SWITCHED OFF
as a high temperature
of air coming into the carburettor causes a
DECREASE
in the engine
POWER
and
therefore engine efficiency
•
In all cases of horizontal flight in conditions of increased humidity with the air
temperature becoming lower than +10°C, carburettor heating must be
SWITCHED ON
•
In-flight fuel consumption is to be monitored by using the fuel level indicators for both
tanks and the clock. When the
RESIDUAL FUEL
red light on the panel is illuminated, it
means that 30litres of fuel remains in the tanks, this amount will be sufficient for a
MAXIMUM OF
40-45 minutes of flying. See below!
•
Aircraft onwards of No.0604 have an improved emergency fuel capacity monitoring
system that provides a separate remaining fuel warning in the main fuel tanks. When the
remaining fuel reaches
15litres
, the fuel quantity low warning lights come on
FUEL
RIGHT
or
FUEL LEFT. This applies to HA-YAV
•
Controlled changes to in-flight engine power is recommended as followings -
a) to reduce power (conditions) -
•
DECREASE
the boost pressure
•
DECREASE
the engine crankshaft rotational speed to the specified one
•
ADJUST
the boost pressure
b) to increase power (conditions) –
Summary of Contents for 18T
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